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Title:
Mine door structure
United States Patent 2621725
Inventors:
Anthony, Shacikoski
Publication Date:
12/16/1952
Assignee:
Anthony, Shacikoski
Primary Class:
Other Classes:
160/40, 160/210, 160/350, 160/368.1, 160/DIG.8, 299/12
International Classes:
E21F1/10
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